1ESF

STAPHYLOCOCCAL ENTEROTOXIN A


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.204 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal structure of the superantigen staphylococcal enterotoxin type A.

Schad, E.M.Zaitseva, I.Zaitsev, V.N.Dohlsten, M.Kalland, T.Schlievert, P.M.Ohlendorf, D.H.Svensson, L.A.

(1995) EMBO J. 14: 3292-3301


  • PubMed Abstract: 
  • Staphylococcal enterotoxins are prototype superantigens characterized by their ability to bind to major histocompatibility complex (MHC) class II molecules and subsequently activate a large fraction of T-lymphocytes. The crystal structure of staphylo ...

    Staphylococcal enterotoxins are prototype superantigens characterized by their ability to bind to major histocompatibility complex (MHC) class II molecules and subsequently activate a large fraction of T-lymphocytes. The crystal structure of staphylococcal enterotoxin type A (SEA), a 27 kDa monomeric protein, was determined to 1.9 A resolution with an R-factor of 19.9% by multiple isomorphous replacement. SEA is a two domain protein composed of a beta-barrel and a beta-grasp motif demonstrating the same general structure as staphylococcal enterotoxins SEB and TSST-1. Unique for SEA, however, is a Zn2+ coordination site involved in MHC class II binding. Four amino acids including Ser1, His187, His225 and Asp227 were found to be involved in direct coordination of the metal ion. SEA is the first Zn2+ binding enterotoxin that has been structurally determined.


    Related Citations: 
    • Zinc Regulates the Function of Two Superantigens
      Fraser, J.D.,Urban, R.G.,Strominger, J.L.,Robinson, H.
      (1992) Proc.Natl.Acad.Sci.USA 89: 5507
    • Structure of Toxic Shock Syndrome Toxin 1
      Prasad, G.S.,Earhart, C.A.,Murray, D.L.,Novick, R.P.,Schlievert, P.M.,Ohlendorf, D.H.
      (1993) Biochemistry 32: 13761
    • Three-Dimensional Structure of a Human Class II Histocompatibility Molecule Complexed with Superantigen
      Jardetzky, T.S.,Brown, J.H.,Gorga, J.C.,Stern, L.J.,Urban, R.G.,Chi, Y.I.,Stauffacher, C.,Strominger, J.L.,Wiley, D.C.
      (1994) Nature 368: 711
    • Characterization of Two Distinct Mhc Class II Binding Sites in the Superantigen Staphylococcal Enterotoxin A
      Abrahmsen, L.,Dohlsten, M.,Segren, S.,Bjork, P.,Jonsson, E.,Kalland, T.
      (1995) Embo J. 14: 2978
    • Crystal Structure of Staphylococcal Enterotoxin B, a Superantigen
      Swaminathan, S.,Furey, W.,Pletcher, J.,Sax, M.
      (1992) Nature 359: 801


    Organizational Affiliation

    Molecular Biophysics, Chemical Centre, Lund University.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
STAPHYLOCOCCAL ENTEROTOXIN A
A, B
233Staphylococcus aureusGene Names: entA
Find proteins for P0A0L2 (Staphylococcus aureus)
Go to UniProtKB:  P0A0L2
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CD
Query on CD

Download SDF File 
Download CCD File 
A, B
CADMIUM ION
Cd
WLZRMCYVCSSEQC-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.204 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 53.600α = 90.00
b = 62.500β = 96.00
c = 75.100γ = 90.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
X-PLORmodel building
X-PLORphasing
DENZOdata reduction
X-PLORrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1996-07-11
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance